Portion of a shoe sole



FIG. 1 is a right side perspective view of a portion of a shoe sole of the present design;

FIG. 2 is a left side perspective view thereof;

FIG. 3 is a right side plan view thereof;

FIG. 4 is a left side plan view thereof;

FIG. 5 is a top side plan view thereof;

FIG. 6 is a back side plan view thereof; and,

FIG. 7 is a bottom side plan view thereof.

The uneven broken line showing of the remainder of the shoe is for illustrative purposes only and forms no part of the claimed design. The unshaded areas form no part of the claimed design. 

The ornamental design for a portion of a shoe sole, as shown and described. 